Kajsa R. Holland-Goon William J. Stephenson Alena Leeds Noah S. Lindberg 20250310 application/service https://doi.org/10.5066/P13RSPFV The U.S. Geological Survey collected a grid of microtremor data points using Smartsolo 3-component seismic sensors from August 7th to August 11th, 2023. These sensors have a five hertz resonance frequency. The grid was deployed over a section of the Utsalady Point fault that runs east-west across the southern portion of the Naval Air Station Whidbey Island, Washington State. For four days, a sub-grid of about 75 sensors were deployed to record passive seismic data for a few hours to overnight and then removed. Each 75 sensor sub-grid was re-deployed near or adjacent to the previous grid (see map). In total, data from 572 microtremor stations were collected with 3 meters spacing in the north-south direction and 4 meters spacing in the east-west direction. A separate transect of six Smartsolo microtremor stations was acquired along N Saratoga Street, with about 400 m spacing between sensors. This transect was collected across fault strands of the Devil’s Mountain fault. Files are in Seismic Analysis Code (SAC) format. Microtremor data can be accessed at https://ds.iris.edu/mda/24-028/ Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The data were collected to model subsurface structure and obtain shear-wave velocity profiles. 20230807 20230813 ground condition Complete None planned -122.73170 -122.65343 48.37176 48.31357 None Geophysics Seismology Structural Geology USGS Metadata Identifier USGS:6750b004d34ed8d385853403 None Whidbey Island Washington State Devils Mountain Fault Zone Utsalady Point Fault None. Please see 'Distribution Info' for details. None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. William J Stephenson USGS - ROCKY MOUNTAIN REGION Research Geophysicist physical

Colorado School of Mines,1711 Illinois St

Golden CO 80401 303-273-8573 wstephens@usgs.gov No formal attribute accuracy tests were conducted No formal attribute accuracy tests were conducted Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. No formal horizontal positional accuracy tests were conducted No formal vertical positional accuracy tests were conducted The U.S. Geological Survey collected a grid of microtremor data points using Smartsolo 3-component seismic sensors from August 7th to August 11th, 2023. 20241015 0.000000001 0.000000001 Decimal degrees World Geodetic System 1984 (WGS 84) WGS_1984 6378137.0 298.257223563 U.S. Geological Survey GS ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P13RSPFV None 20250310 GHSC Data Steward U.S. Geological Survey, ROCKY MOUNTAIN REGION Open Data Policy coordinator mailing

Mail Stop 966, Box 25046

Denver Colorado 80225 United States 303-273-8500 ghsc_metadata@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998